4.6 NSX Controller Cluster
VMware NSX Controller instances are typically deployed to the NSX Edge cluster and are responsible for the following functions:
• Responsible for the switching and routing modules in the hypervisors
• Remove the VXLAN dependency on multicast routing/PIM in the physical network
• Provide suppression of ARP broadcast traffic in VXLAN networks
• Provide the control plane to distribute network information to ESXi hosts
• Are clustered for scale-out and high availability